Egbert z



:i e 6: i ibn-11th taten @anni ffice.

HOT-AIR FURNAGB.

"itt: .rlgstulr :stemt tu in these @titers atmtn'nt mating putt nf its time;

Specication of certain Improvements in Furnaces for Heating Dwellings, &c., invented by ROBERT Z. LIDDLE, of Brooklyn, in the county of Kings, and State of New York. l

My invention relates to that classA of furnaces which is used for the purpose of heating air to be supplied to dwellings through suitable conducting-pipes; and it consists in- First, the combination with the main body of the furnace, which is deeply tinted or sinuated longitudinally so as to provide suitable ilues for the passage upward of the products of combustion without the disadvantages attendant'on vertical joints, of a double or single suspended feeder or reservoir for supplying fuel to the iirepot."

Said reservoir or feeder may be made double, with two walls, for the purpose of providing extra heating-surfaces between or on the adjacent sides of said walls, or it may be made single, as preferred. i

Second, the combination with the said suspended feeder or reservoir, when made double, of suitable airchannels for supplying the heating-surfaces of the said feeder or reservoir with air from the cold-air chamber, instead of from the hot-air chamber; andA Third, the combination with a single or double feeder, constructed substantially as hereinafter described, and the fire-pot of -a furnace, of a door opening directly into said fire-pot, by which access may be obtained directly to :said re-pot forthe purpose of lighting tires, Ste.

i In'the accompanying drawings g l Figure 1 is a side elevation of the furnace removed from the brick-work setting.

Figure 2 is a vertical central section of the furnace complete on a plane passing from front to rear.

Figure 3 is aplan of the same, the top of the brick-work having been removed.

Figure 4 is a plan of the same, ,the upper smoke-fines being removed in addition to the `top of the brick-work,

'Figure 5 is a plan of the same parts shown in fig. 4, exceptl that the frame or connecting-rings which connect the upper smoke-flues to the main body, the cover of the feeder, and the outer wall of brinck-work, are removedI A is the main body of the furnace.- It is deeply sinuous or indented longitudinally, as clearly shown .in fig. 5, whereby fines, a a a, for the passage of smoke from the fire-pot B to the upper smoke-*fines C C C, are formed between said main body A and the outside of the feeder D. It is evident that these smoke-dues a a a will not leak gas since there are no vertical joints in them to'connect them to the air-chamber or passages. This form of the main bodyallows the said feeder to bebrought up close to the inner curve of the sinuosities of the main body, so that a. more effectual actionis obtained as the heat isbrought more' closelyin contact with the surfaces to be heated, and the surface on which the heat acts is increased. As a consequence of this arrange. ment, the same amount of heat'will produce a greater effect. Anotheradvantage connected with these sinuosi- 'ties is the increase in the amount of heating surface for heating the air on the outside of the main body A,

The feeder D, as shown in the drawings, is double, cast in sections, and encloses between its-two walls .a hot-air chamber, E, which is supplied with air to be heated from the cold-air chamber F, between the brick walls G and Hthrough the pipes or channels I I I. Another hot-air chamber, J, is enclosed between the wall and the outside offthe-main body A. This. hot-air chamber is supplied with cold air to he heated from the. cold-air chamber F, throughopenings b b b at the bottom' of the wall G. A door, K, which communicates directly with the re-pot B, is set in the front of the furnace. By means of this door, ready and direct access may be obtained to the fire-pot B for the purpose of lighting fires, Btc. L is `a door, which opens into the feeder D through the box or conductor M. T he coal to supply the fire is shovelled into this box or conductor M, whence it slides down into the feeder Il).- A damper or cut-od', N,'is made to slide over the openning in the cover O of the feeder D. 'It is operated by a handle projecting through the front of the furnace, as at 1c, tig. 2. While light= ing a. fire, or for'the purpose of increasing combustion, the cut-oit` N is drawn out, as shown, by which the draught is permitted to pass directly-'from the grate 'tothe chimney, up through the coal in the feeder D, thence through the connecting-pipes P and Q. After the fire hasbecome suciently started or has attainedsnfricient strength, the damper N is closed and the fire then burns only below the feeder D, the products-of combustion passing up between the main'bc'dy and thefeeder through the lues a a a, into and through the upper smoke-hues C C C, `and into the ring R; they thence pass into the connecting-pipeQ, which carries them to the chimney.J The ire= pot is supplied with'air to support combustion through the door S, which permits the air to pass into the ash= pit '.l, whence it Ends its way to the re through the grate Ui The air to supply the cold-air chamber may be introduced inthe usual manner by a suitable conducting-pipe or conveyer extending to the outside of the building. f

The object of extendingthc pipes I I I through-the wall or casing G, and into the cold-air space F, is twofoldrrst, it supplies the said feeder with' colder air than it would if the said pipes terminated in and were supplied from the space within the casing or wall G, because the air in the last-mentiened space is considerably heated in passing up around and in contact with the fire-pot, which is the hottest part of the furnace, and also in contact with the other parts of the furnace, and by thus supplying the feeder with colder air, the said feeder is more effectually prevented from becoming overheated, and danger of warping or fracturing the parts of the heater through the unequal expansion of said parts is thereby much more effeetually prevented; second, the

air for supplying the feeder being taken from the cold-airspace, a greater amount of air can b e heated, without overheating any part of the furnace, and the air is not deteriorated by coming in contact with the overheated parts.

The principal advantages which my invention possesses over others of its class are, first, the increased heating-surface which is obtained by combining with a deeply sinuated body, A, the feeder D which may be made either single or double, though I consider the double feeder the best; second, the increase in the amount of air heated which is obtained by supplying the feeder D with cold air through the pipes or channels I I I, instead of with hot air; and third,`the ready and direct'aecess which I obtain to the interior of the hre-pot by means of the door K, whereby am enabled to adjust vthe materials for lighting the fire, and also to ascertain by inspection the condition of thel said lire while in process of ignition and at other times.

First. I do not claim in a base-burning stove or furnace having a supply-cylinder,` an escape-passage through the feed-chute so-that the supply-cylinder may be filled with coal without obstructing said passage.

Second. Nor do I claim the combination with the chute-M of the damper N.

Third. Nor do I claim the combination with a base-burning furnace of the chute M,vby which coal may be passed into the cylinder D at a point below the top G of the furnace.

Fourth. Nor do I claim in a base-burning f urnaee a door opening directly into the fire-pot, by which direct access may be obtained to the fire.

AI am aware that furnaces with deeply-cor1ugated sides have been used before; these I do not claim, but

1. The combination, with the main body of a furnace, constructed substantially as described, 'of a single or double feeder, substantially as and for the purpose set forth.

2. Extending the conductingpipes or channels I II, or their equivalents, for supplying the double feeder l with air through the walls or casing which encloses the furnace and into the cold-air space beyond said wall or easing, so as to supply said feeder with cold ar,'substantially as hereinabove set forth. l

3. The combination, in an air-heating furnace containing a single or double feeder, of the'annular ue or ring R, with short pipes or connections C, connecting the smoke-chamber with' said ring, said short pipes or connections and ring being surrounded by air-passages, substantially as described.

4. The combination,-in an air-heating furnace containing a single or double feeder, of the sliding damper N with the annular lue or ring R, and shbrt pipes or connections C, substantially as described.

5. Closing or reducing the size of the openings through one or more of the short pipes or connections C inlan air-heating furnace containing a single or double feeder to equalize the draught from the combustion-chamber,

' and to shut off direct communication from 'the combustion-chamber to the exit-pipe, substantially as described.

ROBERT z. LIDDLE.

Witnesses:

Tnos. HINwooD, JAMES S. LAURENCE, 

